Testing device and testing system for power unit

Abstract

The utility model provides a testing device and a testing system for a power unit. The testing device comprises a power supply module which comprises an AC-DC conversion module and an inversion module, the input end of the AC-DC conversion module is connected with commercial power, and the AC-DC conversion module can convert AC voltage of the commercial power into DC voltage; the input end of the inversion module is connected with the output end of the AC-DC conversion module and can convert the DC voltage into a three-phase AC voltage, and the three-phase output end of the inversion module can be connected with the power unit so as to supply power to the power unit; the control module is connected with the AC-DC conversion module and the inversion module and can control the power supply voltage provided by the power supply module to the power unit; the control module can also be connected with a power unit, and can detect whether one or more of on-off of a switching tube of the power unit, a direct current bus voltage, a capacitor voltage, an output voltage waveform or a bypass state is normal or not. The testing device can conveniently and quickly test the power unit of the high-voltage frequency converter, and is small in size, light in weight and high in reliability.

Description

TECHNICAL FIELD

[0001] The utility model relates to test field, especially a kind of testing device for power unit and testing system for power unit. BACKGROUND

[0002] Power unit is the core element of high-voltage frequency converter, and it is crucial to test and maintain power unit.The existing testing device cannot test power unit independently, for example, output voltage waveform usually needs to be tested by external oscilloscope, voltage and / or voltage-sharing state of capacitor usually needs to be tested by manual method, bypass detection usually needs to be measured by multimeter, and power unit usually needs to be powered by power-frequency adjustable transformer, which is large in size, heavy in weight and low in reliability.Therefore, a new testing device is needed to solve the above problems.

[0003] The content of the background section merely represents the best of the inventor's knowledge and is not necessarily a representation of the state of the art in the field. SUMMARY

[0004] To solve one or more of the problems in the prior art, the utility model provides a testing device for power unit, comprising: power module, the power module includes ac-dc conversion module and inverter module, the input end of the ac-dc conversion module is connected with commercial power, and commercial ac voltage can be converted into dc voltage;The input end of the inverter module is connected with the output end of the ac-dc conversion module, and the dc voltage can be converted into three-phase ac voltage, and the three-phase output end of the inverter module can be connected with the power unit to power the power unit;And control module, the control module is connected with the ac-dc conversion module and the inverter module, and the power supply voltage provided by the power module to the power unit can be controlled;The control module can also be connected with the power unit, and whether one or more of the switch tube on-off, dc bus voltage, capacitor voltage, output voltage waveform or bypass state of the power unit is normal can be detected.

[0005] Optionally, the testing device further comprises: filter module, the input end of the filter module is connected with the three-phase output end of the inverter module, and the output end of the filter module is connected with the three-phase input end of the power unit;The filter module and the inverter module are integrated.

[0006] Optionally, the control module comprises controller and voltage regulation module, the voltage regulation module is connected with the ac-dc conversion module and the controller, and the output voltage of the ac-dc conversion module can be controlled by the controller through the voltage regulation module to adjust the power supply voltage of the power unit.

[0007] Optionally, the control module comprises a controller and a first voltage acquisition module, the first voltage acquisition module is connected to the DC bus and can acquire the DC bus voltage of the power unit; the controller is connected to the first voltage acquisition module and can detect whether the DC bus voltage of the power unit and / or the amplitude of the output voltage waveform is normal according to the DC bus voltage acquired by the first voltage acquisition module.

[0008] Optionally, the power unit comprises a first capacitor, a second capacitor and a third capacitor connected between the DC buses, and a first voltage equalization resistor, a second voltage equalization resistor and a third voltage equalization resistor connected in parallel with the first capacitor, the second capacitor and the third capacitor respectively; the control module further comprises a second voltage acquisition module and a third voltage acquisition module connected to the controller, the first voltage acquisition module, the second voltage acquisition module and the third voltage acquisition module can acquire the voltages of the first measurement point, the second measurement point and the third measurement point respectively, and the controller can detect whether the voltages of the first capacitor, the second capacitor and the third capacitor are normal and / or whether they are equalized according to the voltages of the first measurement point, the second measurement point and the third measurement point.

[0009] Optionally, the control module comprises a pulse width detection module, the pulse width detection module comprises a first resistor, a second resistor, a first optocoupler and a second optocoupler, the first resistor and the second resistor are connected to the output end of the power unit, the first optocoupler and the second optocoupler are connected to the first resistor, the second resistor and the controller; the controller can detect the pulse width of the output voltage waveform of the power unit according to the output signals of the first optocoupler and the second optocoupler.

[0010] Optionally, the control module comprises a bypass detection module, the bypass detection module comprises the pulse width detection module, a first switch and a second switch, the first switch and the second switch are connected to the output end of the power unit and the controller respectively, the controller can control the first switch and the second switch to be conductive, and detect whether the bypass of the power unit is mis-triggered according to the output signals of the first optocoupler and the second optocoupler.

[0011] Optionally, the power unit comprises a power unit control module and a bypass switch, the power unit control module is connected to the bypass switch and the controller and can control the on-off of the bypass switch according to the instructions of the controller; the controller can detect whether the bypass of the power unit can be normally executed according to the output signals of the first optocoupler and the second optocoupler.

[0012] Optionally, the test device further comprises a test switch connected to the controller, the controller can control the on-off of the test switch to control the test device to be turned on or off.

[0013] Optionally, the test device further comprises a discharge switch and a discharge resistor, one end of the discharge resistor is connected to the DC bus, the other end of the discharge resistor is connected to the discharge switch, and the controller is connected to the discharge switch and can control the on-off of the discharge switch.

[0014] Optionally, the control module is connected to the power unit through an optical fiber, the control module comprises an optical fiber transceiver, the optical fiber transceiver is connected to the optical fiber, and the optical fiber is connected to the power unit.

[0015] Optionally, the control module further comprises a communication module connected to the controller, the test device is connected to an upper computer through the communication module, and can work based on an instruction of the upper computer; the communication module comprises one or more of a Bluetooth module, a WiFi module, a ZigBee module, a 4G module or a 5G module.

[0016] The utility model further provides a test system for power unit, include: as above described test device, test device with power unit communication connection, and upper computer, upper computer with test device communication connection, can control test device test power unit switch tube on-off, DC bus voltage, capacitor voltage, output voltage waveform or bypass state one or more whether normal.

[0017] Optionally, the upper computer comprises a processor and a display screen, the processor is connected to the test device and the display screen, and the processor can control the display screen to visually output the test results and / or test report of the power unit.

[0018] The test device and the test system can conveniently and quickly test the power unit of the high-voltage frequency converter, can supply power to the power unit, can send control commands to control the operation of the power unit, can receive the state word uploaded by the power unit, can detect whether one or more of the switch tube on-off, the DC bus voltage, the capacitor voltage, the output voltage waveform, or the bypass state of the power unit is normal, and can visually output the test results, and can also generate a test report, has small volume, light weight, and high reliability. BRIEF DESCRIPTION OF DRAWINGS

[0019] The accompanying drawings are included to provide a further understanding of the utility model, and constitute a part of the specification, and are used to explain the utility model together with embodiments of the utility model, and do not constitute the limitation to the utility model.In the drawings,

[0020] Figure 1 The schematic diagram of the test device according to some embodiments of the utility model is shown.

[0021] Figure 2A partial schematic view of a test device according to some embodiments of the present utility model is shown.

[0022] Figure 3 A schematic view of a test device according to some embodiments of the present utility model is shown.

[0023] Figure 4 A schematic view of a power unit according to some embodiments of the present utility model is shown.

[0024] Figure 5 A partial schematic view of a test device according to some embodiments of the present utility model is shown.

[0025] Figure 6 A partial schematic view of a test device according to some embodiments of the present utility model is shown.

[0026] Figure 7 A partial schematic view of a test device according to some embodiments of the present utility model is shown.

[0027] Figure 8 A partial schematic view of a test device according to some embodiments of the present utility model is shown.

[0028] Figure 9 A partial schematic view of a test device according to some embodiments of the present utility model is shown.

[0029] Figure 10 A partial schematic view of a test device according to some embodiments of the present utility model is shown.

[0030] Figure 11 A schematic view of a test system according to some embodiments of the present utility model is shown. DETAILED DESCRIPTION

[0031] In the following, only certain exemplary embodiments are briefly described. As will be obvious to those skilled in the art, the embodiments described can be modified in various different manners, without departing from the spirit or scope of the present utility model. Accordingly, the drawings and descriptions are to be regarded as illustrative in nature and not as restrictive.

[0032] In the description of the utility model, it is necessary to understand that the orientation or positional relation indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like is the orientation or positional relation based on the orientation or positional relation shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features limited by "first", "second" can explicitly or implicitly include one or more of the features. In the description of the utility model, the meaning of "multiple" is two or more than two, unless otherwise specifically limited.

[0033] In the description of the utility model, it should be explained that, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "coupling" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected, it can be mechanical connection, or electrical connection or can communicate with each other, it can be directly connected, or indirectly connected through intermediate medium, it can be the communication or interaction relationship between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0034] In the utility model, unless otherwise specifically defined and limited, the "upper" or "lower" of the first feature to the second feature can include that the first and second features are in direct contact, or the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the "upper", "upper" and "upper" of the first feature to the second feature include that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The "below", "below" and "below" of the first feature to the second feature include that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0035] The following provides many different embodiments or examples for implementing various structures of this invention. To simplify the invention, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0036] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0037] This invention provides a testing device for power units. Figure 1 A schematic diagram of a testing apparatus 100 according to some embodiments of the present invention is shown. Figure 1 As shown, the test apparatus 100 includes a power supply module 10 and a control module 20. The power supply module 10 includes an AC / DC conversion module 11 and an inverter module 12. The input terminal of the AC / DC conversion module 11 is connected to AC mains power, converting AC voltage (e.g., AC 220V) to DC voltage (e.g., DC 0-1300V). The input terminal of the inverter module 12 is connected to the output terminal of the AC / DC conversion module 11, converting the DC voltage to three-phase AC voltage. The three-phase output terminals AC1, AC2, and AC3 of the inverter module 12 can be connected to the power unit 200, for example, connected to the three-phase input terminals R, S, and T of the power unit 200 respectively, to supply power to the power unit 200. The control module 20 is connected to the AC / DC conversion module 11 and the inverter module 12, and can control the power supply voltage provided by the power supply module 11 to the power unit 200. The control module 20 can also be connected to the power unit 200 and can detect whether one or more of the following are normal: the on / off state of the power unit 200's switching transistor, DC bus voltage, capacitor voltage, output voltage waveform, or bypass state. In some embodiments, the switching transistor may include an insulated-gate bipolar transistor (IGBT), but is not limited thereto.

[0038] Figure 2 A partial schematic diagram of a testing apparatus 100 according to some embodiments of the present invention is shown. For example... Figure 1 and Figure 2As shown, the control module 20 includes a controller 21 and a voltage regulation module 22. The voltage regulation module 22 connects the AC / DC conversion module 11 and the controller 21. The controller 21 can control the output voltage of the AC / DC conversion module 11 through the voltage regulation module 22 to regulate the supply voltage of the power unit 200 (e.g., AC 0-1000V). The controller 21 may include control circuits, a central processing unit (CPU), a microcontroller unit (MCU), a digital signal processor (DSP), other general-purpose processors, application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), complex programmable logic devices (CPLDs) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, and other components and circuits. The voltage regulation module 22 may include boost circuits, buck circuits, etc.

[0039] Figure 3 A schematic diagram of a testing apparatus 100 according to some embodiments of the present invention is shown. For example... Figure 3 As shown, the test device 100 can be connected to the power unit 200 via optical fiber F. Specifically, the control module 20 can be connected to the power unit 200 via optical fiber F. The control module 20 may include an optical fiber transceiver (not shown). The optical fiber transceiver can be connected to optical fiber F, which is connected to the power unit 200, specifically to the power unit control module 201 of the power unit 200.

[0040] In some embodiments, such as Figure 3 As shown, the test device 100 may further include a filter module 13. The input terminals of the filter module 13 are connected to the three-phase output terminals AC1, AC2, and AC3 of the inverter module 12. The output terminals of the filter module 13 are connected to the three-phase input terminals R, S, and T of the power unit 200. The filter module 13 and the inverter module 12 can be integrated into one unit. Alternatively, the filter module 13 and the inverter module 12 can be set up separately. The inverter module 12 may include a three-phase H-bridge inverter. The filter module 13 may include an LRC filter, etc. In practical applications, the configuration can be adjusted according to requirements.

[0041] Figure 4 A schematic diagram of a power unit 200 according to some embodiments of the present invention is shown. Figure 4As shown, the power unit 200 includes IGBT1, IGBT2, IGBT3 and IGBT4. The test device 100 can detect whether the IGBTs of the power unit are normal. The controller 21 can connect the control electrodes g1, g2, g3 and g4 of the IGBT1, IGBT2, IGBT3 and IGBT4, control the IGBT1, IGBT2, IGBT3 and IGBT4 to conduct in turn by controlling the driving signals of the control electrodes g1, g2, g3 and g4, and detect whether the IGBTs of the power unit are normal according to the voltages of the output ends A and B of the power unit 200. Alternatively, the controller 21 can control the upper IGBT1 and IGBT2 to conduct, the lower IGBT3 and IGBT4 to conduct, the pair IGBT1 and IGBT4 to conduct, and the pair IGBT2 and IGBT3 to conduct, and detect whether the IGBTs of the power unit are normal according to the voltages of the output ends A and B of the power unit 200. It should be noted that the detection of the on-off of the switch tubes is introduced by taking the IGBT as an example, and it should be understood that the detection mode of the on-off of other types of switch tubes is similar, which will not be described here.

[0042] Figure 5 A partial schematic view of the test device 100 according to some embodiments of the present application is shown. As shown in FIGS. 1, 2 and 3, Figure 2 , Figure 4 and Figure 5 As shown, the control module 20 includes a voltage acquisition module 23. The voltage acquisition module 23 includes a first voltage acquisition module 231, a second voltage acquisition module 232 and a third voltage acquisition module 233. The first voltage acquisition module 231, the second voltage acquisition module 232 and the third voltage acquisition module 233 can include a resistance voltage division step-down sampling circuit and an analog-to-digital converter (ADC), but are not limited thereto. The first voltage acquisition module 231 is connected to the DC bus and can acquire the DC bus voltage of the power unit 200. The controller 21 is connected to the first voltage acquisition module 231 and can detect whether the DC bus voltage and / or the amplitude of the output voltage waveform of the power unit 200 is normal according to the DC bus voltage acquired by the first voltage acquisition module 231. Alternatively, the first voltage acquisition module 231 is connected to the first measurement point T1 and can acquire the voltage of the first measurement point T1, and the controller 21 takes the voltage of the first measurement point T1 to ground (vBUS+ to 0VF voltage in FIG. 1) as the DC bus voltage. It should be understood that the amplitude of the output voltage waveform of the power unit 200 is equal to or substantially equal to the size of the DC bus voltage. Figure 4

[0043] In some embodiments, as shown in FIGS. 1, 2 and 3, Figure 4 and Figure 5 ​As shown, the power unit 200 includes a first capacitor C1, a second capacitor C2 and a third capacitor C3 connected between the DC buses (between DC+ and DC-), and a first voltage equalization resistor r1, a second voltage equalization resistor r2 and a third voltage equalization resistor r3 connected in parallel with the first capacitor C1, the second capacitor C2 and the third capacitor C3 respectively. The first capacitor C1 is connected to the DC bus DC+. The third capacitor C3 is connected to the DC bus DC-. The second capacitor C2 is connected at the positive terminal to the first capacitor C1 and at the negative terminal to the third capacitor C3. The first voltage equalization resistor r1 is connected to the DC bus DC+. The third voltage equalization resistor r3 is connected to the DC bus DC-. The second voltage equalization resistor r2 is connected at the positive terminal to the first voltage equalization resistor r1 and at the negative terminal to the third voltage equalization resistor r3. The first measurement point T1 is the connection point of the DC bus DC+ and the positive terminal of the first voltage equalization resistor r1. The second measurement point T2 is the connection point of the positive terminal of the second capacitor C2 and the positive terminal of the second voltage equalization resistor r2, i.e. the connection point of the negative terminal of the first capacitor C1 and the negative terminal of the first voltage equalization resistor r1. The third measurement point T3 is the connection point of the positive terminal of the third capacitor C3 and the positive terminal of the third voltage equalization resistor r3, i.e. the connection point of the negative terminal of the second capacitor C2 and the negative terminal of the second voltage equalization resistor r2. The first voltage acquisition module 231, the second voltage acquisition module 232 and the third voltage acquisition module 233 can respectively acquire the voltages of the first measurement point T1, the second measurement point T2 and the third measurement point T3. The controller 21 can detect whether the voltages of the first capacitor C1, the second capacitor C2 and the third capacitor C3 are normal and / or whether the three are voltage-equalized according to the voltages of the first measurement point T1, the second measurement point T2 and the third measurement point T3. For example, the controller 21 can calculate the voltage difference between the first measurement point T1 and the second measurement point T2, the voltage difference between the second measurement point T2 and the third measurement point T3, and the voltage difference between the third measurement point T3 and the DC bus DC- (i.e. the voltage of VBUS+, 2 / 3Vbus and 1 / 3Vbus to 0VF respectively, as shown in the figure) according to the voltages of the first measurement point T1, the second measurement point T2 and the third measurement point T3 respectively acquired by the first voltage acquisition module 231, the second voltage acquisition module 232 and the third voltage acquisition module 233 respectively. The voltages across the first capacitor C1, the second capacitor C2 and the third capacitor C3 respectively can be obtained. The controller 21 can detect whether the voltage across a single capacitor is normal by comparing the voltages across the first capacitor C1, the second capacitor C2 and the third capacitor C3 with the preset voltages respectively. The controller 21 can detect whether the three are voltage-equalized by comparing the voltages across the first capacitor C1, the second capacitor C2 and the third capacitor C3. It can be understood that, as shown in the figure, the controller 21 can detect whether the voltages of the first capacitor C1, the second capacitor C2 and the third capacitor C3 are normal and / or whether the three are voltage-equalized according to the voltages of the first measurement point T1, the second measurement point T2 and the third measurement point T3. Figure 4 Figure 4 ​As shown, the capacitors C4, C5, C6 are connected in parallel with the first capacitor C1, the second capacitor C2 and the third capacitor C3 respectively. The controller 21 can determine whether the voltages of the capacitors C4, C5, C6 are normal and / or whether the three capacitors are balanced by detecting whether the voltages of the first capacitor C1, the second capacitor C2 and the third capacitor C3 are normal and / or whether the three capacitors are balanced.

[0044] In some embodiments, as shown in FIG. 1, the test device 100 includes a control module 20. Figure 2 As shown, the control module 20 includes a pulse width detection module 24. Figure 6 A partial schematic diagram of the test device 100 according to some embodiments of the present application is shown. As shown in FIG. 2, the test device 100 includes a control module 20. Figure 6 As shown, the pulse width detection module 24 includes a first resistor R1, a second resistor R2, a first optocoupler OC1 and a second optocoupler OC2. The first resistor R1 and the second resistor R2 are connected to the output terminals A, B of the power unit 200. The first optocoupler OC1 and the second optocoupler OC2 are connected to the first resistor R1, the second resistor R2 and the controller 21. The controller 21 can detect the pulse width of the output voltage waveform of the power unit 200 according to the output signals of the first optocoupler OC1 and the second optocoupler OC2. For example, the power unit 200 outputs a PWM wave or a SPWM wave. The first optocoupler OC1 can measure the positive half-axis pulse width of the output voltage waveform. The second optocoupler OC2 can measure the negative half-axis pulse width of the output voltage waveform. The controller 21 can calculate the pulse width of the output voltage waveform of the power unit according to the positive half-axis pulse width measured by the first optocoupler OC1 and the negative half-axis pulse width measured by the second optocoupler OC2. In this way, the test device 100 can realize the pulse width detection of the output voltage waveform of the power unit. The controller 21 can realize the pulse amplitude detection of the output voltage waveform of the power unit according to the DC bus voltage collected by the first voltage collection module 231. Thus, the test device can realize the detection of the output voltage waveform of the power unit. The pulse width and the pulse amplitude of the output voltage waveform measured by the present application are digital quantities. Compared with analog collection, the data quantity will be greatly reduced, the waveform transmission rate and real-time performance can be improved, and the detection efficiency and accuracy can be improved. In some embodiments, the output voltage waveform of the power unit and the detection result thereof can be visually output by the host computer 300 (refer to the host computer 300 of FIG. 3) and / or a test report can be generated. Figure 2

[0045] In some embodiments, as shown in FIG. 1, the test device 100 includes a control module 20. Figure 2 As shown, the control module 20 includes a bypass detection module 25. Figure 7 A partial schematic diagram of the test device 100 according to some embodiments of the present application is shown. As shown in FIG. 2, the test device 100 includes a control module 20. Figure 7 ​As shown, the bypass detection module 25 includes the pulse width detection module 24, a first switch K1 and a second switch K2. The first switch K1 and the second switch K2 can include relays or the like. The first switch K1 and the second switch K2 are connected to the output ends A, B of the power unit 200 and the controller 21, respectively. The controller 21 can control the first switch K1 and the second switch K2 to be turned on, and detect whether the bypass of the power unit 200 is mis-triggered according to the output signals of the first optocoupler OC1 and the second optocoupler OC2.

[0046] Figure 8 A partial schematic diagram of the testing device 100 according to some embodiments of the present application is shown. As shown, Figure 8 As shown, the first optocoupler OC1 includes a light source A1, a light receiver Vo1 and an output end P-UV. The second optocoupler OC2 includes a light source A2, a light receiver Vo2 and an output end N-UV. If the A1 is bright, the P-UV outputs a low level and the N-UV outputs a high level, the controller 21 can determine that the bypass of the power unit is not executed, the bypass is not mis-triggered, and the bypass state is normal. If the A1 is not bright, the P-UV outputs a high level and the N-UV outputs a high level, the controller 21 can determine that the bypass of the power unit is executed or is broken down by the bypass, the bypass is mis-triggered, and the bypass state is abnormal.

[0047] In some embodiments, Figure 9 A partial schematic diagram of the testing device 100 according to some embodiments of the present application is shown. As shown, Figure 4 and Figure 9 As shown, the power unit 200 includes a power unit control module 201 and a bypass switch K0. The bypass switch K0 can be connected to the DC bus DC+DC- and located at the output end of the power unit 200. The power unit control module 201 is connected to the bypass switch K0 and the controller 21. The power unit control module 201 can control the on-off of the bypass switch K0 according to the instruction of the controller 21. The controller 21 can detect whether the bypass of the power unit 200 can be normally executed according to the output signals of the first optocoupler OC1 and the second optocoupler OC2. As shown, Figure 8 and Figure 9As shown, for example, the controller 21 sends a control command to the power unit control module 201, the power unit control module 201 executes the control command, and controls the bypass switch K0 to be off. If A1 is not on, the P-UV output is high, and the N-UV output is high, the controller 21 can determine that the power unit has executed bypass or has been broken by bypass, the bypass is mis-triggered, and the bypass state is abnormal. If A1 is on, the P-UV output is low, and the N-UV output is high, the controller 21 can determine that the power unit cannot normally execute bypass, and the bypass state is abnormal.

[0048] In some embodiments, as shown in Figure 2 The test device 100 (or the control module 20) further includes a test switch 26 connected to the controller 21. The controller 21 can control the test switch 26 to be on or off to control the test device 100 to be on or off. For example, the controller 21 controls the test switch 26 to be on, and the test device 100 can be controlled to be on. The controller 21 controls the test switch 26 to be off, and the test device 100 can be controlled to be off.

[0049] In some embodiments, the test device 100 can perform self-checking before testing the power unit 200. For example, as shown in Figure 1 and Figure 2 The test device 100 (or the AC / DC conversion module 11) is connected to the mains, the controller 21 controls the test switch 26 to be on, the voltage regulation module 22 adjusts the output voltage of the AC / DC conversion module 11, and the controller 21 can detect whether the test device 100 is normal according to the output voltage of the AC / DC conversion module 11. The test device 100 performs self-checking before testing the power unit 200, which helps to eliminate measurement errors caused by test device abnormalities and helps to improve the reliability of test results.

[0050] In some embodiments, as shown in Figure 2 The test device 100 (or the control module 20) further includes a discharge switch 27 and a discharge resistor 28. Figure 10 A partial schematic view of the test device 100 according to some embodiments of the present application is shown. As shown in Figure 2 and Figure 10As shown, one end of the discharge resistor 28 is connected to the DC bus DC+, and the other end is connected to the discharge switch 27. The discharge switch 27 is connected to the DC bus DC-. The controller 21 is connected to the discharge switch 27. The controller 21 can control the on-off of the discharge switch 27. For example, the controller 21 is connected to the control electrode of the discharge switch 27, and by controlling the driving signal of the control electrode of the discharge switch 27, the on-off of the discharge switch 27 is controlled. After the test device 100 completes the test of the power unit, the controller 21 can control the discharge switch 27 to be turned on, so that the discharge resistor 28 consumes the electric energy, avoids causing harm to the human body, and improves the safety of the test.

[0051] In some embodiments, the switch tube / first switch K1 / second switch K2 / bypass switch K0 / test switch 26 / discharge switch 27 can include any switch device that can play the same or similar role, such as a field effect transistor (FET), a bipolar junction transistor (BJT), a relay, a silicon controlled rectifier (SCR), a contactor, a circuit breaker, a potentiometer, a mechanical switch, etc. The FET can be a metal oxide semiconductor field effect transistor (MOSFET). The MOSFET can be a P-channel metal oxide semiconductor field effect transistor (PMOS). Alternatively, the FET can be an N-channel metal oxide semiconductor field effect transistor (NMOS). The MOSFET can be a silicon carbide (SIC) MOSFET, a gallium nitride (GaN) MOSFET, etc. power device, which has lower loss, higher efficiency and better performance. In actual application, it can be determined according to the needs. These are within the protection scope of the present application.

[0052] In some embodiments, as Figure 2As shown, the control module 20 further comprises a communication module 29 connected to the controller 21. The test device 100 can be communicatively connected to the host computer 300 through the communication module 29. The communication module 29 comprises one or more of a Bluetooth module, a WiFi module, a ZigBee module, a 4G module or a 5G module. But not limited to this. The test device 100 can work based on the instruction of the host computer 300. Alternatively, the test device 100 can work based on the built-in program instruction. In actual application, it can be set according to the needs.

[0053] The utility model further provides a kind of test system for power unit. Figure 11 The schematic diagram of the test system 400 according to some embodiments of the utility model is shown. As Figure 11 As shown, the test system 400 comprises the test device 100 and the host computer 300 as described above. The test device 100 is communicatively connected to the power unit 200, for example, through the aforementioned communication module 29. The host computer 300 is communicatively connected to the test device 100, for example, through the aforementioned optical fiber F. The host computer 300 can control the test device 100 to test whether one or more of the switch tube on-off, the DC bus voltage, the capacitor voltage, the output voltage waveform or the bypass state of the power unit 200 is normal.

[0054] In some embodiments, as Figure 11 As shown, the host computer 300 comprises a processor 301 and a display screen 302. The processor 301 is connected to the test device 100 and the display screen 302. The processor 301 can control the display screen 302 to visualize the test results and / or the test report of the power unit. The test report of the power unit can be generated by the processor 301 of the host computer 300. Alternatively, the test report of the power unit can be generated by the controller 21 of the test device 100. Alternatively, the test report of the power unit can be generated by the power unit control module 201 of the power unit itself. These are all within the protection scope of the utility model. The processor 301 can comprise processing circuitry, CPU, MCU, DSP, ASIC, FPGA, CPLD or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components and the like. The display screen 302 can comprise LCD display screen (liquid-crystal display, LCD), LED display screen (light emitting diode, LED), OLED display screen (organic light emitting diode, OLED) and the like.

[0055] The testing device and the testing system can conveniently and quickly test the power unit of the high-voltage frequency converter, can supply power to the power unit, can send a control command to control the work of the power unit, can receive a state word uploaded by the power unit, can detect whether one or more of switch tube on-off, DC bus voltage, capacitor voltage, output voltage waveform, or bypass state of the power unit is normal, can visually output the test result, can further generate a test report, and have small volume, light weight and high reliability.

[0056] It should be noted that, although several modules of the power unit / testing device / testing system are mentioned in the foregoing detailed description, such division is merely not mandatory. In fact, according to the embodiments of the present application, the features and functions of two or more modules described above can be implemented in one module. Conversely, the features and functions of one module described above can be further divided into modules for specific implementation.

[0057] It should be noted that the present application can only include any one or more features of any one or more embodiments. Figures 1-11 In other words, not all the features shown must be implemented in the testing device and the testing system of the present application.

[0058] Finally, it should be noted that: the above only describes the preferred embodiments of the present application, and is not used to limit the present application, although the present application has been described in detail with reference to the foregoing embodiments, for those skilled in the art, the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A testing device for a power unit, characterized by The power module comprises an AC / DC conversion module and an inverter module, the input end of the AC / DC conversion module is connected to the commercial power supply, and the commercial power supply AC voltage can be converted into a DC voltage; the input end of the inverter module is connected to the output end of the AC / DC conversion module, and the DC voltage can be converted into a three-phase AC voltage, and the three-phase output end of the inverter module can be connected to the power unit to supply power to the power unit. The control module is connected to the AC / DC conversion module and the inverter module, and can control the power supply voltage provided by the power module to the power unit; the control module can also be connected to the power unit, and can detect whether one or more of the switching tube on-off, DC bus voltage, capacitor voltage, output voltage waveform, or bypass state of the power unit is normal. The filter module is integrated with the inverter module. The control module comprises a controller and a voltage regulation module, the voltage regulation module is connected to the AC / DC conversion module and the controller, and the controller can control the output voltage of the AC / DC conversion module through the voltage regulation module to adjust the power supply voltage of the power unit.

2. The test device of claim 1, wherein, The control module comprises a controller and a first voltage acquisition module, the first voltage acquisition module is connected to the DC bus to acquire the DC bus voltage of the power unit; the controller is connected to the first voltage acquisition module, and can detect whether the DC bus voltage and / or the amplitude of the output voltage waveform of the power unit is normal according to the DC bus voltage acquired by the first voltage acquisition module. The power unit comprises a first capacitor, a second capacitor and a third capacitor connected between the DC buses, and a first voltage balancing resistor, a second voltage balancing resistor and a third voltage balancing resistor connected in parallel with the first capacitor, the second capacitor and the third capacitor respectively; the control module further comprises a second voltage acquisition module and a third voltage acquisition module connected to the controller, the first voltage acquisition module, the second voltage acquisition module and the third voltage acquisition module can acquire the voltages of a first measurement point, a second measurement point and a third measurement point respectively, and the controller can detect whether the voltages of the first capacitor, the second capacitor and the third capacitor are normal and / or whether they are balanced according to the voltages of the first measurement point, the second measurement point and the third measurement point.

3. The test device of claim 1 or 2, wherein, The control module comprises a pulse width detection module, the pulse width detection module comprises a first resistor, a second resistor, a first optocoupler and a second optocoupler, the first resistor and the second resistor are connected to the output end of the power unit, and the first optocoupler and the second optocoupler are connected to the first resistor, the second resistor and the controller; the controller can detect the pulse width of the output voltage waveform of the power unit according to the output signals of the first optocoupler and the second optocoupler.

4. The test device of claim 1 or 2, wherein, ​ 5. The test device of claim 4, wherein, ​ 6. The test device of claim 3, wherein, ​ 7. The test device of claim 6, wherein, The control module comprises a bypass detection module, the bypass detection module comprises the pulse width detection module, a first switch and a second switch, the first switch and the second switch are connected with the output end of the power unit and the controller respectively, the controller can control the first switch and the second switch to be turned on, and according to the output signals of the first optocoupler and the second optocoupler, whether the bypass of the power unit is mis-triggered is detected.

8. The test device of claim 7, wherein, The power unit comprises a power unit control module and a bypass switch, the power unit control module is connected with the bypass switch and the controller, and can control the on-off of the bypass switch according to the instruction of the controller. The controller detects whether the bypass of the power unit can be normally executed according to the output signals of the first optocoupler and the second optocoupler.

9. The test device of claim 3, wherein, Further comprising: A test switch connected with the controller, the controller can control the on-off of the test switch to control the test device to be turned on or off.

10. The test device of claim 3, wherein, Further comprising: A discharge switch and a discharge resistor, one end of the discharge resistor is connected with the DC bus, the other end of the discharge resistor is connected with the discharge switch, and the controller is connected with the discharge switch and can control the on-off of the discharge switch.

11. The test device of claim 1 or 2, wherein, The control module is connected with the power unit through an optical fiber, the control module comprises an optical fiber transceiver, the optical fiber transceiver is connected with the optical fiber, and the optical fiber is connected with the power unit.

12. The test device of claim 3, wherein, The control module further comprises a communication module connected with the controller, the test device is connected with an upper computer through the communication module, and can work based on the instruction of the upper computer; the communication module comprises one or more of a Bluetooth module, a WiFi module, a ZigBee module, a 4G module or a 5G module.

13. A test system for a power unit, characterized by Comprising: The test device according to any one of claims 1-12, the test device is connected with the power unit; And An upper computer connected with the test device, the upper computer can control the test device to test whether one or more of the on-off of the switch tube of the power unit, the DC bus voltage, the capacitor voltage, the output voltage waveform or the bypass state is normal.

14. The test system of claim 13, wherein, The upper computer comprises a processor and a display screen, the processor is connected with the test device and the display screen, and the processor can control the display screen to visually output the test results and / or test report of the power unit.

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